420653 has 4 divisors (see below), whose sum is σ = 432060. Its totient is φ = 409248.

The previous prime is 420613. The next prime is 420671. The reversal of 420653 is 356024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 316969 + 103684 = 563^2 + 322^2 .

It is a cyclic number.

It is not a de Polignac number, because 420653 - 2⁸ = 420397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5648 + ... + 5721.

It is an arithmetic number, because the mean of its divisors is an integer number (108015).

2⁴²⁰⁶⁵³ is an apocalyptic number.

It is an amenable number.

420653 is a deficient number, since it is larger than the sum of its proper divisors (11407).

420653 is a wasteful number, since it uses less digits than its factorization.

420653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11406.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 420653 is about 648.5776746081. The cubic root of 420653 is about 74.9275151537.

Adding to 420653 its reverse (356024), we get a palindrome (776677).

The spelling of 420653 in words is "four hundred twenty thousand, six hundred fifty-three".